HomeMy WebLinkAboutObservation of Excavation 02.09.2023l(+rlf,mffto''*
An ãrÞloy*r gtmrüd Compony
502ü County Roscl i54
Clenwnod Springs. CCI 8lS0l
phane: {97S} 945"7988
fax: {970i 945-8454
emaíl : k*glen*'ood@kuinarusa.*um
w*rv.kumarusa.c_oin
0füce lÆeafi*ns: Benver {FåQ}, Parkeç Colcrrarlo Springs, Èìart Ccllins, {iisnw'arrd Springs. and Sumnrit f-ounty, (}rln¡ado
February 9,2023
Loose Cannon
Attn: Trevor Cannon
P.O. Box 1717
Carbondale, Colorado 81623
trev,o{@$mbrpl I a:roofi n ¡¿.pam
Project No. 2l-7- 570.û1
Subject: Observation of Excavation, Proposed Office/\Marehouse, 5ió9 Counfy Road 154,
Garfield County, Colorado
Dear Trevor:
As requested, the undersigned representative of Kumar & Associates, Inc. observed the
excavation at the subject site on January 30,2023 to evaluate the soils exposed for foundation
support. The findings of our observations and recommendations for the foundation design are
presented in this report. We previously conducted a subsoil study for design of foundations at
the site for a similar project and presented our findings in a report dated October 20,2021,
Project No. 21-7-570.
The proposed office/warehouse building will be a tall, one-story warehouse with a second story
offiee in the southem half of the building. Foundations \r/ere designed for an allowable soil
bearing pressure of 4,û00 psf.
At the time of our visit to the site, the grade foundation excavation had been cut in one level up
to 4 feet below the adjacent ground surface. The soils exposed in the bottom of the excavation
were variable and consisted of gravelly sand with some ciay and silty sand and gravel fill in the
northern end and relatively dense, slightly silty sandy gravel in the rest of the excavation. The
fïll areas appeared to be relatively dense. No free water was encountered in the excavation and
the soils were slightly moist to moist. The footing subgrade was eompacted with a walk-behind
sheepsfoot compactor.
The soil conditions exposed in the excavation are consistent with those previously encountered
on the site and suitable for support of spread footings designed for the recommended allowable
bearing pres$¡rs of 4,000 psf. Loose and disfurbed soiis should be removed in the footing areas
to expose the dense to hard subgrade soils. The bearing soils should be protected &om frost and
concrete should not be placed on frozen soils. Other recommendations presented in our previous
report which are applicable should also be observed.
The recommendations submitted in this letter are based on our observation of the soils exposed
within the foundation excavation and the previous limited subsurface explCItation at the site.
Variations in the subsurface conditions below ths excavation could increase the risk of
foundation movernent. We should be advised of any variations encountered in the excavation
conditions for possible changes to recommendations contained in this letter. Our services do not
Loose Cannon
February 9,2A23
Page2
include deterrnining tJre presence, prevention or possibility of rnold or other biological
contaminants (MOBC) deveioping in the future. If the client is concerned about MOBC, then a
professional in this special field of practice should be consulted.
If you have any questions or need further assistance, please call our cffice.
Sincøely,
Kumar & .4.ssoclrtes,
Daniel E. Haldin,
DEH/kac
Kumar & Aseoeides, lnc, s Pmjeet Nc.2f .7.5fS,ûf